Hydrocharideae
A monotypic native aquatic genus, spread over Europe and North Asia. The species thrives in any still water. It may be readily increased by seeds; or by runners, which root at the joints.
H. Morsus-ranae (Frogbit). fl. rather large; outer segments of perianth pale green, shorter and narrower than the inner white ones; peduncles of male plant rather short, bearing two or three flowers; pedicel of female enlarged at top into a short perianth tube. Summer. l. stalked, orbicular, entire, cordate at base, rather thick, about 2in. in diameter. Stems floating, with floating tufts of leaves, peduncles, and fibrous roots. (Sy. En. B. 1444.)